Use of p-Formylbenzoate to Construct two Copper(II) Complexes: Syntheses, Crystal Structures and Magnetic Properties

Two new Cu(II) complexes, [Cu(phen)(H2O)(fba)(ClO4)]center dot H2O (1) and (1)(infinity)[Cu(bpy)(H2O)(fba)(2)] (2) (phen=phenanthroline, bpy=2,2'-bipyridine Hfba=p-formylbenzoic acid) were synthesized by solution-based method and characterized by single-crystal, powder X-ray diffraction methods, IR spectroscopy, TG-DTA analyses, elemental analyses, and magnetic measurements. Compound 1 is a mononuclear structure crystallizing in the space group P (1) over bar and 2 shows a 1D chain structure which belongs to the space group Pbca. Through non-covalent interactions the complex molecules are assembled into 3D supramolecular network structures. The variable temperature magnetic measurements of 1 shows a weak ferromagnetic and antiferromagnetic behavior in the range of 300 similar to 7 and 7 similar to 2 K, respectively, while the 2's suggests very weak ferromagnetic interactions between Cu(I) ions in the experimental temperature range. CCDC: 912745, 1; CCDC: 912746, 2.